I just replaced the front end on my EX500, while I was in the neighborhood I took the time to install the tapered bearing kit from ALL BALLS RACING, as it's a 1991 with the OEM still in there, no other reason for that they are old, and I might as well.
The hardest part was installing the new races, which BTW wasn't hard, just have to take your time. I installed the triple tree, and adjusted the stem nut by feel, no need for torque wrench here.
It's nice and smooth now, and feels solid, the old ones were still good, but getting wore, old, etc.. And I needed to service them anyway, so might as well just upgrade.
Here is the kit I used
All Balls Steering Stem Bearing Kit for Kawasaki Eliminator Ninja
https://www.amazon.com/dp/B000GU3Y66..._bdtEzbSJMBYP8